香林香达铜矿床位于内蒙古苏尼特右旗境内,属于华北板块北缘多金属成矿带的一部分.区内覆盖较厚,为草原景观区,地表露头较少,地质填图和化探方法难以满足勘查需求.本次在探矿权范围内,通过大比例尺激电中梯面积测量圈定了两处激电异常(1km2),有效缩小了找矿靶区范围.结合可控源音频大地电磁测深精测剖面对激电中梯异常部位进行剖析,圈定了地下极化异常体的空间位置.经钻探验证激电异常为矿致异常,见矿总厚度15m,铜的最高品位3.14%,平均品位1.21%.确定了本区可控源音频大地电磁测深反演剖面高阻异常的边缘部位,构造带低阻异常区内相对高阻异常部位为矿体位置,证实了激电中梯面积测量配合频率域电磁法在覆盖区内金属矿勘查中得有效性,相关研究成果为该类覆盖区找矿提供参考依据.
Xianglinxiangda copper mine is located in Sunite Right Banner,Inner Mongolia.It belongs to a part of polymetallic metallogenic belt on the northern margin of North China Plate.It is a grassland landscape area with thick coverage and few outcrops.It is difficult for geological mapping and geochemical exploration methods to meet the exploration needs.Two IP anomalies(1km2)were delineated by measuring the IP middle ladder area of large scale within the scope of prospecting right,effectively narrowing the scope of prospecting target area.Combined with the fine profile of controlled source audio magnetotelluric sounding,the abnormal part of IP elevator is analyzed and the spatial location of underground polarizing abnormal body is delineated.The IP anomaly was verified by drilling as ore-induced anomaly,the total thickness of the ore was 15m,the highest grade of copper was 3.14%,and the average grade of copper was 1.21%.The edge part of high resistivity anomaly in the inversion profile of controlled source audio magnetotelluric sounding and the relatively high resistivity anomaly part in the low resistivity anomaly area of the structural belt are identified as the ore body location,which proves the effectiveness of IP middle step area measurement combined with frequency domain electromagnetic method in metal ore exploration in the covered area.This research results provide a reference basis for prospecting in this type of covered area.